Method of producing hoisting slings



July 27, 1943. A. MAZZELLA METHOD OF PRODUCING HOIS TING SLINGS Filed Sept. 26, 1942 2 Sheets-Sheet 1 Ahi'onio' Mazzella.

July'27,- 1943. A MAZZELLA 2,325,261

METHOD OF PRODUCING HOISTING SLINGS Filed Sept. 26, 1942 2 Shets-Sheet 2 SlH UC/HM AnZ-onio Maz zelza/ Patented July 27, 1943 iwS TE' f A l izi lz i I senator-Bantam ri'dis iNGf 11- A to i M rie wl r it 36hr 1 mitates.sweater 26, iii' gfsa-a N9. 459,851 e m s? -s te 1 a This invention relates to the omcialgclass fof l eyes: ibeingflunhoisting and pulling and more particularly a wrapped forclarity; of illustrationiii, hoisting sling'and method ,ofpmak ng thesame j Fig-371s an enlarged sideyiewbt i{th from wire rope, cable andthe like. 11,1 eyes as wrappedand completed. 1.

One of the. objects of this invention is to p ro;- .F'igs. 8 to 11 'nclusive. are perspeotive-jviews of vide a hoisting sling which has ,a high degree of the minimum strength sling; ashavingprogressed flexibility, is non-spinning, non-kinking and .throughsuccessivesteps'of mymethod with open having a high degree of liftingeapacity and twists in Eig.-ll.,fil i6larity.;, s le t e 1 12 F 2 s nen areedp rspe. ei ie o one Another object of-this invention} residesin the end of the second-size sling with the'eyes thereprovision of a hoisting sling formedfrom a single of unwrapped,-. Q g strand of twisted wire, rope and the like, .In thepresent illustration of this inventiQnthe f A further objectofthis invention resides in numeral 5jdesignatesglll gcneralga flexible-cable that method of constructing a hoisting sling from constructed of twisted wire or other suitable maa single strand of twisted wire, rope and the like 15, terial, the same having its opposite ends looped whereby the lifting capacity and tensile strength and suitably fastened to the body portion of the thereof is limited only by the number of steps of cable to form, what is herein termed, primary my method practiced in producing the same. eyes 6 and 1. 1

A still further object of this invention resides The next step in'my method is practiced by i in the particular manner of forming the'secondfolding the cable B'thus formed into three memary eyes in the original and other cables produced bers .8,'-9 and I0 as illustrated in Fig. 2 of thetherefrom. drawings for the purpose of measurement,it be- In addition to the foregoing objects this invening important that the extreme ends II and H. tion resides in the particular manner of con-. of the looped portions thereof terminate at the structing the original cable for subsequent pracextreme ends of the eyes. Subsequent to so tice of my method in producing hoisting slings measuring the cable,'the.1ooped portion ll there having predetermined strengths. of adjacent the eye 6 is marked-as indicated by One of the salient features of this invention v the numeral l2 and pinched or otherwise fasresides in the particular manner of retaining the tened together as indicated by the numeral '13 primary and secondary eyes of the cable in registo form a secondary eye [4 from which, then tration prior to final binding thereof. extend-sections 8, 9 and I0. With the cable Among the paramount objects of this invention constructed as aforesaid the members 15 and vH5 is the particular manner of finally binding the are helically twisted together as illustrated in primary and secondary eyes together to form Fig, 4 but by tight winding as illustrated in Fig.

permanent loops. 5, the winding thereof necessarily being con- With these and other objects in view this intinued in the same direction that the individual vention resides in certain novel features of constrands of the cable lay, however, the winding struction and arrangement of elements to be may be either right or left. hereinafter more particularly set forth in the With the inner portion of the longermember specification, illustrated in the accompanying 40 I6 and shorter member l5 twisted together as. drawings and pointed out in the appendedclaims above mentioned, the loop portion I I is formed and, while this disclosure depicts my present coninto a secondary eye I! and secured by suitable the hoisting sling is constructed.

ception of the invention, the right is reserved to means, indicated by the numeral I8, to the priresort to such change in construction and mary eye I whereupon the then outer portion arrangement of elements as come within thespirit of the member I6 is helically twisted around of the invention. the first mentioned twisted members in such In the accompanying drawings forming a part manner that it lies within the channels formed I of this application: by the initial twisting step, subsequent to which Fig, 1 is a side view of the cable from which the eye 6 is registered with the secondary eye H and secured thereto by any suitable means.

Figs. 2 to 5 inclusive show the cable as having Upon completing the aforesaid Steps in my progressed through successive steps of my method method, the eyes so formed at the extr t of with open twists in Fig. 4 for clarity. the then twisted cable may be wrapped by suit Fig. 6 is a perspective View of the cable as able material I9 as indicated in Fig. 7 of th having been constructedinto a sling of the mini-.55 drawings to form a three part sling, h

where a sling of greater strength is desired, wrapping of the eyes of the sling thus formed and the aforesaid steps of my method are repeated with the exception that the free portion A of the partially completed sling, indicated in Fig. 11 of the drawings, is wound in the channels thereof so the strands forming the original cable extend in a direction'opposite to those of said previously wo ld mernbers, subsequent to which operationjthe eyessuch as indicated'by the letter B in Fig. 1 2 of the drawings are formed and wrapped by suitable material 19 however,

conventional thimbles, not shown, may be inserted therein to obviate wear" thereon. Through'practice of my method, it is apparent a high degree of strength and flexibility is Obtained from hoisting slings so constructed while therewith and securing. the same together, twisting the free portion of the cable on the aforesaid twisted portions thereof in the channels of the same and with its strands extending in the same direction as those of the original cables,

- disposing the primary eye on the free end of the cable againstand in registration with the first mentioned secondary eye and securing the same together, andwrapping those registered primary and and secondary ey'e's'at the ends of; the twisted portions of the cable. v

' 2. Thatmethod of constructing a hoisting sling consisting of forming primary eyes at the [ends of a cable; forming a secondary eye in a '15 certain portion of the cable, helically twisting V certain portions of the cable together beyond the secondary eye, forming another secondary eye at the disadvantages of kinking thereof-are-entirely obviated and; due to use of a single cable in building up slings of predetermined strength,

waste. is eliminated and thus the cost of "pro duction thereofreduoed to theiminiinuin;

-Having thus desoribed' my' invention'what I claim and desire -to protect by Letters Patent'is:

L-That inethod of constructing a "hoisting sling consisting "of forming primary 'eyesin a singlelength-"o1 cable, forming a secondaryeye in a certain portion of thecablerhelically twisting a-certain portion of the cable together-beyond thesecondaryeye, forming-anothersecondary eye in the cable at the extremity of the twisted 'Vportions' thereof disposing the same against a certain primary-eye in registration the extremity-of said twisted portions of the cable and securing the same to the adjacent primary eye, twisting the free portions of the cable onthe aforesaid twistedportions thereof in the channels o'f the same'andwith its strands extendin'g'inthe same direction asxthose of the original cable, securing the'prirnary eye onthe free end of the' oabl'e to the first mentioned'seconda'ry eye in registration therewith, subjecting 

